Specific steps must be taken to decertify a union, just as specific steps are required to certify one. Which of the following must take place before a certified union may be decertified?

Group of answer choices

The NLRB must issue the employer a warning that the union may be decertified.

A union representation election must take place.

A decertification petition must be filed with the employer.

A decertification petition must be filed with the NLRB$.$